TDA5225XUMA1

The IC is a low power ASK/FSK Receiver for the frequency bands 300-320, 425-450,
863-870 and 902-928 MHz.
The chip offers a very high level of integration and needs only a few external
components.
The device is qualified to automotive quality standards and operates between -40 and
+105°C at supply voltage ranges of 3.0-3.6 Volts or 4.5-5.5 Volts.
The receiver is realized as a double down conversion super-heterodyne/low-IF
architecture each with image rejection. A fully integrated Sigma-Delta Fractional-N PLL
Synthesizer allows for high-resolution frequency generation and uses a crystal oscillator
as the reference. The on-chip temperature sensor may be utilized for temperature drift
compensation via the crystal oscillator.
The high performance down converter is the key element for the exceptional sensitivity
performance of the device which take it close to the theoretical top-performance limits.
It demodulates the received ASK or FSK data stream independently which can then be
accessed via separate pins. The RSSI output signal is converted to the digital domain
with an ADC. All these signals are accessible via the 4-wire SPI interface bus. Up to 4
pre-configured telegram parameters can be stored into the device offering independent
pre-processing of the received data to an extent not available till now. The down
converter can be also configured in single-conversion mode at moderately reduced
selectivity performance but at the advantage of omitting the IF ceramic filter.